Metal C-Ring for Internal Pressure (CI) and External Pressure (CE) are designed for high pressure (system pressure energised). They require low bolting load and have good spring back.
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Metal O Ring
The ridal c ring for axial pressure is designed to seal shaft to bore. Close tolerances for borth shaft and bore are required.
The Oysterseal ® is designed for maximum spring back, and as a consequence is a low load seal. Because of the low load it will only obtain a good tightness with very soft plating or coatings.
Metal CS-Ring for Internal Pressure (CSI) and External Pressure (CSE) are designed for high pressure and excellent tightness performance (system pressure energised). They require high bolting load and have good spring back.